Survey: More high-schoolers concerned about their grades

Teens are more apt than their high-school counterparts earlier in the decade to worry about their grades and the future of the country, although a large percentage still feel that their own life prospects are bright, according to a poll released Tuesday. Nearly half of teens reported feeling "major" pressure about getting good grades, and 21% of all students polled said they devote in excess of 10 hours per week to homework.